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Feb. 3, 1931. A. E. CHURCH l,790,744

CHUCK Filed Nov. 20, 1926 a motor, and inanother form involving some have 'screw-threaded engagement. 6%

i 25 to Fig. 2 of a modification. 7 A recess 27 is provided in the cup2( that Patented Feb. 3, 1931 v E790744 L I UNITED STATESP'AITENTV' OFFICE Application filed November 20, 1926. Serial no. 149,646.

Myinvention relates to improvements in with the screw-threaded nipple or stem" on chucks, of the form that is known as machine the lathe spindle. 1 w chucks, having a set of jaws that travel in In each of the radial chambers 12 there is radial ways forelfeeting the adjustment for operatively housed for slidingv movement a :5 work of different diameters, and the object cup or carriage 20 in the form of an elon- 55 of my improvement isto produce a chuck gated block-like'structure, and in whichis that is adapted for heavy duty and that is housed the screw 21. adapted to have the jaws set in various ways, The screw 21 is immediately back of the as in one form, either by hand or by means of jaw 1 1 and the opposed portions 22 thereof change in details, by hand either substan The cup 20 has a chamber .23 for operatially directly or by means of a gear drive, tively housing the screw 21 and the rearporand also, that can be arranged to be set by tion 24 of saidscrew 21 has screw-threaded power derived from the main spindle or engagement with the opposed portion'of said shaft through the medium of suitable intercup 20. 1 i

connecting gearing. Thus means are provided for effecting In the accompanying drawing relative to and fro movement of the cup and a Figure 1 is an end faceview of a chuck the screw as one part and the j awas another embodying my invention. part. g I Figure 2 is a sectional view on the line The screw 21 is positioned in the cup 20 as 2-2 of Fig. 1, on a reduced scale. follows :At the middle of the screw 21 is Figure 3 is an edge view of one of the jaw an integral collar-like projection 25-tl1at is and the adjacent parts. supported by a reduced portion 26 of cylin- Figure 4 is a sectional view corresponding drical form.

Figure 5 is a similar sectional view on fits the collar 25.- another modification. The screw 21 has an opening 28 in the end Figure 6 is a fragmentary rear elevation for a wrench. of the form that is shown in Figs. 1 and 2 The cup 20 is moved to and fro-by means 780 showing the recesses in the back'for receivof a bell-crank lever- 29 that is supported so ing the positioning tip of the shaft for the from the back 15 by a pin 30 that is held'in motor or power driven setting mechanism. place in suitable bearings 31 by means of a My improved chuck 10 comprises a body cotter-pin 32. 11 that has a set of radially directed cham- The short end 33 of the lever 29 projects bers 12 that are open at the front to provide forwardly into a recess 34 in an enlargement slots 13 through which project the jaws 14;, 35- of the cup 20, the opposed faces being the latter being of stepped form. rounded so as to permit of operative engage- T he body 11 is opposed to and encloses the ment for moving the cup responsive to moveback 15 and a ring 17, secured by means of ments f th l v screws 16, to said body, completes the hous- Th l d 36- f th lever 29 j t #0 goutwardly generally radially and by its ex- The back 15 is chambered to provide for treme end engages within a recess 37 in the housing various devices to be described'and opposed face of a plunger 38 and which is is closed at the rear by means of said ring or housed in suitable Ways 39 for to and fro annular plate 17, said plate being admitted movement in parallelism'with the axis of into a recess 18. j the chuck. V V

The structure as a whole is supported from Longitudinal movements ofthe plunger 38 a face-plate by means of screws 19 in the are effected through the medium of a worm forms that are shown. In some cases the connection with alarge ring f1(), and which is back may be screw-threaded for engaging located so as to cooperate wlth the rearend portion 41 of said plunger. Said rear end portion 41 of the plunger 38 has a worm-rack 42 on the-inside face and the ring has a screw-thread or worm on the periphery 43.

The rear end portion of the ring 40 rides:

For cooperating with the top face 47 there r is provided a pinion gear 48 that ispart of a stub-shaft structure 49 that 1s operatively housed in any proper manner in a radlal chamber 50 and that has the outer end face exposed and provided with a non-circular opening 51 for a Wrench.

For cooperating with'the inside face 46 there is provided means for using a pinion gear 52 that is part of a removable and separate shaft structure .53 that is located in parallelism with the axis of the chuck and that may have the main or body portion 54 Connected in any desired manner with a motor forpower operation.

As shown, the shaft structure 53 is pro:

vided at the front end with a tip 55 that is relatively reduced and tapered and that is entered into acooperatiug recess 56' in the structure of the back 15. I

Rotationv of either piniongear serves to rotate the ring andthro'ugh the intervening connections tomove thecup's and the jaws supported thereby. I 7

The jaws 14 are provided on one side face with longitudinally directed scratchelines or marks 57 that cooperate with a set of rings 58 having markings 59 for settin the jaws for a particular diameter of work, the rings 58 being spacedat oneshalf inch intervals.

' In the structure that is shown in 4 the ring 40a extends around the outside of the plunger 88a and is inside the power set-- ting shaft 53a. I V

In the structure that is shown in Fig. 5 the gear 40b is exposed through the, side wall60 of the back end portion of the chuck structure, the exposed portion being the outside cylindrical face 61 of a radial annular extension'62 and which has a set of radial openings 63 that are adapted for selective use for receiving a pin for directing rotating the ring 406- and thereby efiecting a relatively quick setting of the jaws.

With reference to the recess 56 for receiving the tip 55 of the power shaft 53, a set of such recesses is provided, arranged in a circle, as indicated in Fig. 6, for selective use and these are exposed and accessible-through an open channel space 64 at the rear of the chuck.

' Said recesses 56 are closely adjacent, being o saidlong arms w saidring.

separated by a thin Wan 65. The individual recesses 56 fit the tip 55 closely at the sides and in length, along the middle circumferential line, may have a length about three times the diameter of said tip 55;

I claim as my invention I '1 In a chuck, 'a body having radial ways, jaw bas s operating in said Ways, a bellcranl; for each of said bases; pivotally supported in said body; having a short arm that is engaged with the base, -adjacent theinner end thereof; and having a long arm that is directed outwardly from the pivotal support, 7

faring mountedfor rotation in said body, means for rotating said ring, sald ring havmg a radius longer than the rad al dlstance f-the ja base pivota support from the {1X14 and means o peretive y nnect ng-each 2.- In a chuck descri d 1 c a m 1;, said last named mea s e ng in the forme a single pie plu g r w th th ends respectively posit ly eennectedthe o e With the long arm and the other with'the 3-. in a chuck ha ng a-bedy, jaw bases mounted for movement therein nd a ring, mounted for rotat on, servi g a the me ns for moving said bases, dri e mean 5 id ring, housed in said body, and directed along a radial axis, said ri g eingd a with teeth that are available-for dr ve means that operate on an axis that is in parallelism with the axis of the e IlQk- V 4. In a chuck, a body provided with radial guide-ways, jaws supported by bases that are s dabe in'said guide ays, a elativ lyla ge ring housed for rotation in said body, teeth or the like on one face of aid ring? for cooperating with a power-dri en pi i n fer'efie ing a holding pressureon work held in said jaws, and additional mean fo ooper t with hand operated means vfor use efie ting an initial setting: of the jaws and also for effecting cumulative holding pressure on said Work after the application of, such; power effected holding pressure, 7

.5. In a chuck, a body provi led with a plu V rality ofradial guide-ways, jaw bases slidable in said guide-ways, a ring housec in said body for rotation, a bell-crank pivotally mounted in said body for each of said bases;

having a short arm engaged with the adja-v cent baseg'and provided with radially extended long arm, and a, set of plungers, each in the form of a single piece H cture that is guided 111 said body for to and fro movemerit, servlng lndlv-ldua ly a nnect g means intermediate the corresponding arm and said ring, one end of the plunger being connected to theleng arm and the other end thereof to the ring, the said long arms of; the bell-cranks being directed outwa ,ly from the pivotal supports for the said bellecranks,

the plunger in each case being located outwardly b yond thearm an a ng a no ch extended long arm and a set of plungers,

each in the form of a single piece structure that is guided in said body for to and fro movement, serving individually as connect- 7 ing means intermediate the corresponding arm and said ring, one end of the plunger being connected to the long arm and the other end thereof to the ring, mean-s for driving said ring for shifting said bases in the form of a spur gear, said ring having connected to the long arm and the other end thereof to the ring, said ring having teeth for driving on one face, said body being recessed for admitting removable drive means to said teeth. 7

" ALBERT Ila-"CHURCH- teeth on one face for cooperating with said gear, said teeth and the axis of said gear being parallel with the axis of the chuck, and said body being open at the rear for permitting removal of said gear by a movement in V parallelism with the axis.

7. In a chuck, a body provided with a plurality of radial guide-ways, jaw bases slidable in said guide-ways, a ring housed in said body for rotation, a bell-crank pivotally mounted in said body for each of said bases; having a short arm engaged with the adjacent base; and provided with a radially extended long arm, and a set of plungers, each in the form of a single piece structure that is guided in said body for to and fro movement, serving individually as connecting means intermediate the corresponding arm and said ring, one end of the plunger being connected to the long arm and the other end thereof to the ring, driving means in the form of a spur gear for operating said ring, said body being provided with an annular recess or channel in the rear face, teeth on said ring for engaging with said gear for effecting such operation, said teeth being exposed along one side of said channel, a guide-tip on said end of the gear, and said bottom of the channel being provided with a set of recesses arranged concentric with the axis for admitting said tip for selectively positioning said gear relatively to the chuck body.

8. In a chuck, a body provided with a plurality of radial guide-ways, jaw bases slidable in said guide-ways, a ring housed in said body for rotation, a bell-crank pivotally mounted in said body for each of said bases; having a short arm engaged with the adjacent base; and provided with a radially extended long arm, and a set of plungers, each in the form of a single piece structure that is guided in said body for to and fro movement, serving individually as connecting means intermediate the corresponding arm and said ring, one end of the plunger being 

